PL/SQL Developer ORA-12154: TNS: Unable to parse the specified connection identifier

Background:
On the local machine (Win7 64-bit flagship Edition) Install the Oracle 11g Client32-bit ORACLE clientIf the 64-bit ORACLE client is installed, you cannot enter the sqlplus/nolog command in the CMD command, that is, the command cannot be identified.) After setting the corresponding local service, the following error is prompted with PL/SQL Developer:
"Cocould not load "...... \ Bin \ oci. dll"" This error occurs. PL/SQL is installed on 64-bit win7, and "cocould not load "...... \ Bin \ oci. dll "". I checked the information because PL/SQL only supports 32-bit OS. The solution is to load an additional oci. dll file.
Solution: Link
After Error 1 is corrected, the following error is prompted:
ORA-12154: TNS: Unable to parse the specified connection identifier
Solution:

Go to the main interface of pl SQL Developer, select cancel on the logon interface to enter the main interface, and then select Tools-Preferences (Preferences). In the settings window, select Oracle-Connection. In the corresponding settings window, find Oracle Home (Oracle main directory), select the version of the local client (such as), and save the settings, then restart PLSQL Developer, and then you can log on normally.